CyberPower RB1290X3B

Overview

The CyberPower RB1290X3B is a replacement battery cartridge designed to restore full backup power to compatible CyberPower UPS units like the M1100XL. It contains three sealed lead-acid batteries rated at 12 volts and 9 amp-hours each, providing reliable runtime to keep your critical electronics powered during outages. The cartridge is fully assembled and ready for quick installation, making it a practical solution for maintaining uninterrupted power in data closets, small offices, and home workstations.

Key features

• Preassembled battery cartridge that simplifies replacement and reduces downtime
• Leak-proof and maintenance-free sealed lead-acid batteries eliminate the need for fluid monitoring
• Compatible with CyberPower M1100XL UPS models to ensure seamless integration
• Reusable packaging facilitates responsible recycling and compliance with disposal regulations
• Lightweight design that fits directly into the UPS battery bay without modification
• Backed by an 18-month limited warranty for dependable performance over many charge cycles

Key specs

• Battery type: sealed lead-acid
• Voltage: 12 V per battery
• Capacity: 9 Ah per battery
• Number of batteries: 3
• Dimensions: 7.8 x 5.94 x 4.13 inches (19.8 x 15.09 x 10.49 cm)
• Weight: 17.73 pounds (8.04 kg)
• Warranty: 18-month limited

Installation and setup

The RB1290X3B cartridge arrives fully assembled and prewired, allowing most users to replace the batteries quickly with basic tools. This design minimizes downtime during maintenance and helps keep your UPS system running smoothly without the need for professional service. Its direct fit into the battery bay means no modifications are necessary, making it a straightforward upgrade for existing CyberPower UPS units.

Ideal uses and environments

This replacement battery cartridge is well suited for IT managers, remote workers, and anyone relying on steady power to protect sensitive equipment and data. It works effectively in environments such as small offices, home workstations, and data closets where maintaining continuous power is critical. The maintenance-free design and reliable runtime make it a strong choice for users who need dependable backup power without frequent battery monitoring.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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